With an estimated 500 trillion feet of natural gas, the Marcellus Shale represents a huge opportunity for energy companies. It's not surprising that Chesapeake Energy, Range Resources, and ExxonMobil are just a few of the companies placing massive bets on their ability to produce in this region. In Under the Surface: Fracking, Fortunes, and the Fate of the Marcellus Shale, author Tom Wilber investigates everything from the initial land rush to the innovations in drilling technology. In this audio segment, he discusses those topics and shares why "on-shore drilling" is becoming so important for these companies and their shareholders.

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